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Method for removing cyanide in gold smelting red slag through washing method

A cyanide and gold technology, applied in chemical instruments and methods, solid waste removal, transportation and packaging, etc., can solve problems affecting comprehensive utilization, etc., and achieve the effects of convenient operation, strong environmental protection, and remarkable decyanation effect

Inactive Publication Date: 2021-06-29
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the residual cyanide in the gold smelting red slag has seriously affected its comprehensive utilization

Method used

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  • Method for removing cyanide in gold smelting red slag through washing method
  • Method for removing cyanide in gold smelting red slag through washing method
  • Method for removing cyanide in gold smelting red slag through washing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The gold smelting red slag selected in this embodiment is taken from Lingbao Gold Investment Co., Ltd. The gold smelting red slag sample was tested for the cyanide content of the toxic immersion liquid before treatment, and the measurement results showed that the total cyanide content was 2300mg / L . The specific processing process is:

[0038] Take 2500g of gold smelting red slag, and make pulp with clear water to obtain pulp P1 with a solid content of 30%; press filter the pulp P1 to obtain filter cake S1 and filtrate L1 with a moisture content of 12%; filter cake S1 with clear water to prepare into pulp P2 with a solid content of 30%; press filter the pulp P2 to obtain filter cake S2 ​​and filtrate L2 with a moisture content of 12%; filter cake S2 ​​is made into pulp P3 with a solid content of 30% with clear water; Press filtration to obtain filter cake S3 and filtrate L3 with a moisture content of 12%; use clean water to make filter cake S3 into pulp P4 with a solid...

Embodiment 2

[0040] The gold smelting red slag selected in this embodiment is taken from Chenguang Smelter in Lingbao City. The gold smelting red slag sample was tested for the cyanide content of the toxic immersion liquid before treatment. The measurement results showed that the total cyanide content was 2700 mg / L. The specific processing process is:

[0041]Take 2500g of gold smelting red slag, and make pulp with clear water to obtain pulp P1 with a solid content of 40%; press filter the pulp P1 to obtain filter cake S1 and filtrate L1 with a water content of 10%; filter cake S1 with clear water to prepare into pulp P2 with a solid content of 40%; press filter the pulp P2 to obtain filter cake S2 ​​and filtrate L2 with a moisture content of 10%; filter cake S2 ​​is made into pulp P3 with a solid content of 40% with clear water; Press filtration to obtain filter cake S3 and filtrate L3 with a moisture content of 10%; use clean water to make filter cake S3 into pulp P4 with a solid content...

Embodiment 3

[0043] The gold smelting red slag selected in this embodiment is taken from the gold tailings in Yuling Town, Lingbao City. The gold smelting red slag sample was tested for the cyanide content of the toxic leaching liquid before treatment. The measurement results showed that the total cyanide content was 2860mg / L. The specific processing process is:

[0044] Take 2500g of gold smelting red slag, and make pulp with clear water to obtain pulp P1 with a solid content of 50%; press filter the pulp P1 to obtain filter cake S1 and filtrate L1 with a moisture content of 15%; filter cake S1 with clear water to prepare into pulp P2 with a solid content of 50%; press filter the pulp P2 to obtain filter cake S2 ​​and filtrate L2 with a water content of 15%; filter cake S2 ​​is made into pulp P3 with a solid content of 50% with clear water; Press filtration to obtain filter cake S3 and filtrate L3 with a moisture content of 15%; use clean water to make filter cake S3 into pulp P4 with a...

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Abstract

The invention discloses a method for removing cyanide in gold smelting red slag by a washing method. The method comprises the following steps: adding water into gold smelting red slag to prepare pulp; carrying out filter pressing on the obtained ore pulp to obtain a filter cake and filtrate; adding water into the obtained filter cake to prepare pulp; carrying out filter pressing on the obtained pulp to obtain a filter cake and filtrate; repeatedly and circularly adding water for pulping and performing filter pressing multiple times until the content of cyanide in a leaching solution of a filter cake obtained after the last filter pressing is less than 5 mg / L; combining all the filtrates after the filter pressing operation, and adding a flocculating agent into the obtained mixed solution; carrying out solid-liquid separation on the obtained mixed material; and repeatedly using liquid obtained after solid-liquid separation as water for washing the gold smelting red slag. According to the invention, the method is simple in step, easy to operate and remarkable in decyanation effect, the red slag can be treated into common solid waste, the collected washing liquid can be directly used as water for washing and decyanation of the red slag after being treated, and the resource utilization rate is high.

Description

technical field [0001] The invention relates to the technical field of treatment of gold smelting cyanide tailings, in particular to a method for removing cyanide in gold smelting red slag by washing. Background technique [0002] Red slag is roasted cyanide slag produced by gold smelting enterprises in the process of gold production. Red slag contains highly toxic cyanide and has been included in the national hazardous waste list. At present, most of the red slag produced by gold smelting enterprises is piled up in tailings ponds and cannot be reused. It not only takes up a lot of land, but also has a great impact on the surrounding environment. [0003] In addition to cyanide, gold smelting red slag also contains a large amount of valuable elements. For example, the gold content in some red slag is as high as 3g / t, in addition to containing a large amount of silicon and iron, which has very high comprehensive utilization value. However, the residual cyanide in the gold s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/33B09B3/00A62D101/45
CPCA62D3/33A62D2101/45B09B3/80
Inventor 建方方李壮豫刘娥
Owner HENAN UNIV OF SCI & TECH
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